Compound, complex, and simple sentences

Complex sentence

One independent clause, plus one dependent clause, jointed by a subordinating conjugation (subordinating conjunction may also begin the sentence.)

"When the train arrives and if Mrs. Langlois is in it, she will be served with a subpoena."

A complex sentence as for there is one dependent clause: "When the train arrives and if Ms. Langlois is on it," supported by a independent clause of which is "she will be served with a subpoena," introduced with a subordinating conjugation of which is "when."

"Ottawa is the capital of Canada, but Toronto is the capital of Ontario."

A compound sentence as for there are two independent clauses, "Ottawa is the capital of Canada" and "Toronto is the capital of Ontario," joined together by a fanboy of which is "but."

"Susanne wanted to be here, but she cannot come because her car is in the shop." This is an example of what?

A compound- complex sentence as for there are TWO INDEPENDENT clauses: "Susan wanted to be here" and "But she cannot come," and ONE DEPENDENT clause: "Because her car is in the shop."

"I do not own a Porsche." This is an example of what?

A simple sentence as for there is only ONE INDEPENDENT clause.

Simple sentence

Sentence that contains one independent clause

Compound- complex sentence

Sentence that contains two independent clauses, and one dependent clause.

Compound sentence

Two independent clauses joined by a fanboy conjugation (e.g. for, and, nor, but, or, yet, so, or a semicolon.)